assembler, same solver, different [D].7. 성능 최적화7.1 SparseMatrix[K]는 sparse → scipy.sparse, PETSc 사용 ... Solver: Direct (LU), Iterative (CG, GMRES)Post-Processor: Interpolation, gradient calculation100% 재사용 가능 ... .2.2 Physics-Specific ComponentsMaterial Model: [D] matrix (E,ν vs k vs ε)Source Term: body force b